If a drone weighs more than say 5 lbs, it should require a license to operate. If someone were to lose control and the drone fell out of the sky and hit your child in the head. You would want the operator to be licensed and insured to cover the medical bills, or if it broke your window, or crashed into your car parked in the driveway. Insurance would probably require the licensing, but making it law would clarify things.
Also different licenses for different weight classes. A 2 lb quadcopter wouldn't need a license, but 150 lb drone would require a different class of license than a 20 lb drone, similar to being licensed to drive a Semi Truck vs a normal passenger vehicle. A hobbyist drone shouldn't require a license in the lowest weight class, but to fly a UAV with a 10 ft wingspan, I think they should be both licensed and insured.
Also clarification of privacy laws as it is very difficult to say whether a drone is purposefully taking video through someone's window at a vantage point not possible from the ground or a neighbors house where someone would have a reasonable expectation of privacy.